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Old 12-06-2001, 03:03 AM   #1
ANZAC_1915
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Member#: 456
Join Date: Oct 1999
Chapter/Region: NWIC
Location: Redmond, WA, USA
Vehicle:
2008 Forester XT
Steel Gray Metallic

Default WRX Trailer Hitch Wiring cheat sheet

MY02 WRX Sedan/Wagon + 2.5RS Trailer wiring cheat sheet:

Cut off supplied connector.

1. +12v Blue -- connect to Blue/Red wire on trunk light (requires long wire)
2. Right Green -- connect to LightGreen/Blue in rear RH light assy
3. Stop Red -- connect to White/Blue wire in rear RH light assy
4. Left Yellow -- connect to Blue/Green wire in harness near rear RH light assy
5. Tail Brown -- connect to White/Red wire in rear RH light assy
6. Ground White -- connect to ground Black wire in rear RH light assy

Ref manual pages WI-96, 103, 105.

Don't blame me if your car catches fire.

Glenn
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Old 12-19-2001, 03:16 PM   #2
ae3753
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Member#: 3786
Join Date: Jan 2001
Location: Bay Area, CA
Vehicle:
2002 WRX
WR Blue Mica

Default Thanks!

Glenn,

Thanks for the cheat sheet! I need to install my trailer hitch on my WRX sedan and this is exactly what I was hoping to find. Much appreciated.
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Old 05-07-2002, 02:34 PM   #3
nixima
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Member#: 15654
Join Date: Feb 2002
Location: Rochester, MN
Vehicle:
2002 WRX wagon
Black

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I just spliced my wires for my trailer lights last night on my WRX wagon. I spliced into the wires under the rear passenger side compartment. I just pulled up the foam compartment piece and the wires were right there enclosed in a white rectangular flat plastic harness. There were multiple wires that were the same and I believe you can choose any of them. I found that Glenn's cheat sheet was accurte if I subsitute black in where he has blue in most cases. So here is what I used...

1. +12v Blue -- connect to Blue/Red wire for trunk accessory light
2. Right Green -- connect to LightGreen/Black in rear RH light assy
3. Stop Red -- connect to White/Black wire in rear RH light assy
4. Left Yellow -- connect to Black/Green wire in harness near rear RH light assy
5. Tail Brown -- connect to White/Red wire in rear RH light assy
6. Ground White -- connect to ground Black wire in rear RH light assy
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Old 03-10-2006, 08:29 AM   #4
BamBooI
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Member#: 10945
Join Date: Oct 2001
Chapter/Region: South East
Location: SC
Vehicle:
2006 Evolution IX

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I was wondering when you were wiring the hitch for the 12v power.

Did you get the 12V from where the bulb is connected to the wire on top of the trunk or did you get the 12v from the trunk switch to activate the trunk light? Otherwise the hitch will only get powered when the trunk is open.
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Old 06-22-2015, 08:00 PM   #5
joshuajayg
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Member#: 323310
Join Date: Jun 2012
Chapter/Region: SWIC
Location: The desert
Vehicle:
2002 WRX Wagon
Silver

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I know I am digging up an old thread but since this was a top hit in a Google search, I imagine it is still used. I want to throw some caution out here.

ANZAC did a good job finding the wires but the power wire used is too small for the application. I think it is an 18AWG wire running to the cargo light. At 10 feet, that wire can only carry about 7 amps before the voltage drop exceeds allowable limits and begins to overheat. If you run typical lights at 21/5 watts each and 2 marker lights at 5 watts each, you will be at 5 amps. That's too close for my taste. If you have brighter lights or any more lights, you can actually catch the car on fire. Please use caution.

I ran a power wire under the trim and the driver's side to my battery so I never have to worry about overloading the circuit. It took me about 30 minutes.

Joshua

Last edited by joshuajayg; 06-22-2015 at 08:10 PM. Reason: More accurate numbers
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Old 07-09-2015, 12:37 PM   #6
Veebs
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Join Date: Dec 2014
Chapter/Region: Tri-State
Vehicle:
2003 WRX
Silver

Default

If you have a power and ground wire for a speaker amp in your trunk, you can tie in to those for your main power and ground to the trailer. The wires for that are generally lower gauge (thicker) and are safer to use as joshuajayg was saying.


Last edited by Veebs; 07-09-2015 at 02:52 PM.
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